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cpufreq: Add callback to register with energy model

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Many cpufreq drivers register with the energy model for each policy and
do exactly the same thing. Follow the footsteps of thermal-cooling, to
get it done from the cpufreq core itself.

Provide a new callback, which will be called, if present, by the cpufreq
core at the right moment (more on that in the code's comment). Also
provide a generic implementation that uses dev_pm_opp_of_register_em().

This also allows us to register with the EM at a later point of time,
compared to ->init(), from where the EM core can access cpufreq policy
directly using cpufreq_cpu_get() type of helpers and perform other work,
like marking few frequencies inefficient, this will be done separately.

Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Viresh Kumar 2021-08-10 12:04:33 +05:30
parent bb8c26d938
commit c17495b01b
2 changed files with 27 additions and 0 deletions
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13
drivers/cpufreq/cpufreq.c
View File

@ -1491,6 +1491,19 @@ static int cpufreq_online(unsigned int cpu)
write_lock_irqsave(&cpufreq_driver_lock, flags);
list_add(&policy->policy_list, &cpufreq_policy_list);
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
/*
* Register with the energy model before
* sched_cpufreq_governor_change() is called, which will result
* in rebuilding of the sched domains, which should only be done
* once the energy model is properly initialized for the policy
* first.
*
* Also, this should be called before the policy is registered
* with cooling framework.
*/
if (cpufreq_driver->register_em)
cpufreq_driver->register_em(policy);
}
ret = cpufreq_init_policy(policy);

14
include/linux/cpufreq.h
View File

@ -9,10 +9,12 @@
#define _LINUX_CPUFREQ_H
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/pm_opp.h>
#include <linux/pm_qos.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
@ -373,6 +375,12 @@ struct cpufreq_driver {
/* platform specific boost support code */
bool boost_enabled;
int (*set_boost)(struct cpufreq_policy *policy, int state);
/*
* Set by drivers that want to register with the energy model after the
* policy is properly initialized, but before the governor is started.
*/
void (*register_em)(struct cpufreq_policy *policy);
};
/* flags */
@ -1046,4 +1054,10 @@ unsigned int cpufreq_generic_get(unsigned int cpu);
void cpufreq_generic_init(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table,
unsigned int transition_latency);
static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
{
dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
policy->related_cpus);
}
#endif /* _LINUX_CPUFREQ_H */